What should the idle speed be on a Big Bear?
Never adjust your Big Bear’s idle without first warming the engine. Any adjustments made to a cold engine may cause the idle speed to increase beyond the specified 1,450 to 1,550 rpm range; this can make it difficult to shift gears and cause the engine to race at idle.
How does the carburetor on a Big Bear work?
The Big Bear’s engine was fed a by a single carburetor. The carburetor could be adjusted to alter the engine’s idle speed as well as the amount of air mixed into the carburetor’s pilot fuel system, which fed the engine from idle to a quarter-throttle.
Why is my Yamaha Big Bear 350 running so bad?
On older models, the Big Bear 350 has been known to eventually experience throttle issues, causing the ATV to run terribly. When this happens, the driver might think that the vehicle isn’t receiving enough gas, but in actuality, it could mean that the Big Bear needs to warm up for a moment before racing off.
What to do if your Big Bear 350 cuts off?
If a Big Bear 350 is idling up extremely high and then cutting off, the ATV will most likely be experiencing carburetor issues. If you’re experiencing any carburetor issues, the first step to try to resolve these problems is by removing the carburetor and soaking it for 24 to 48 hours in a carburetor cleaner.
What should idle speed be on Yamaha Big Bear?
Turn on the inductive tachometer. Ideally, the tachometer should indicate an engine idle speed between 1,450 and 1,550 rpm. Look for the black idle adjustment knob attached to a cable on the left side of the carburetor.
What happens when you adjust the carburetor on a Big Bear?
Any adjustments made to a cold engine may cause the idle speed to increase beyond the specified 1,450 to 1,550 rpm range; this can make it difficult to shift gears and cause the engine to race at idle. Do not turn the pilot air screw counterclockwise more than 4 1/2 full turns from its seated position.
Why is my Yamaha Big Bear 350 flooding out?
If this happens, the ATV will eventually act as if it is flooding out. These problems could be due to a cracked or sticky float, or the spark plug might need to be replaced. As with any vehicle, it is best to have a certified dealer or mechanic take a look and potentially fix the problem.
Are there any problems with a Big Bear ATV?
Big Bears aren’t generally made to go past 40 MPH, so if a rider forces the ATV to go any faster ,the transmission could experience problems or become damaged. To prevent transmission failure, do not overwork the vehicle and force it to run at a higher speed.